This Bolt Carrier Group (BCG) comes fully assembled and ready to drop into most mil spec M16″ M4 or AR15 upper receivers. All critical parts are coated with EXO Nickel Boron technology that provides permanent dry lubricity, extreme durability and increases both wear and corrosion resistance.
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Monadnock Firearms is your online destination for firearms, ammunition, and tactical gear—shipped nationwide. Established in 2017 and based in Fitzwilliam, NH, we combine expert service with a seamless eCommerce experience. Proud supporters of Gun Owners of America (GOA) and defenders of the Second Amendment.
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